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The pump and flow & or return is noisy near the boiler when set to HW only or both CH & HW it is quiet when on CH only, could air trapped in the hot water circuit be causing the boiler to over heat? There are no air vents on the hot water circuit. There is a drain off on the one of the pipes...

Hi, I have a fault with an Ideal Icos HE18. It works fine when there is a demand for central heating. When I call for hot water or hot water and central heating simultaneously the boiler displays C and the burner LED blinks constantly. When you first send the demands to boiler it does fire for a...